DS is 14 weeks now, he gained amazingly well for the first 10 weeks or so and has more than doubled his birth weight. However, it has been completely stagnant for 2 weeks now. He isn't that bothered about feeding doesn't seem to be a hungry baby and isn't breast orientated like dc1 was who would never refuse!. Should I be worried? He went from 2nd centile to about 40th but has slipped down to around 17% last week